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X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <699234e2.a70a0220.2c38d7.00e2.GAE@google.com> Subject: [syzbot] [squashfs?] general protection fault in squashfs_copy_data From: syzbot To: linux-kernel@vger.kernel.org, phillip@squashfs.org.uk, squashfs-devel@lists.sourceforge.net, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: cee73b1e840c Merge tag 'riscv-for-linus-7.0-mw1' of git://.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17ff615a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=6d9e410399043c26 dashboard link: https://syzkaller.appspot.com/bug?extid=a9747fe1c35a5b115d3f compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=131e86e6580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=171e86e6580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/a804e6ee01e8/disk-cee73b1e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6bf476ceaefd/vmlinux-cee73b1e.xz kernel image: https://storage.googleapis.com/syzbot-assets/bc7592aa375b/bzImage-cee73b1e.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/8dd42118c823/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a9747fe1c35a5b115d3f@syzkaller.appspotmail.com loop0: detected capacity change from 0 to 8 Oops: general protection fault, probably for non-canonical address 0xe00fed1004f4f8aa: 0000 [#1] SMP KASAN NOPTI KASAN: maybe wild-memory-access in range [0x007f888027a7c550-0x007f888027a7c557] CPU: 1 UID: 0 PID: 5972 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:squashfs_copy_data+0xde/0x220 fs/squashfs/cache.c:308 Code: 74 08 4c 89 e7 e8 52 c8 91 ff 4c 63 fd 49 c1 ef 09 49 83 e7 f8 4d 03 3c 24 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 24 c8 91 ff 89 e8 25 ff 0f 00 00 4d RSP: 0018:ffffc90002ee7430 EFLAGS: 00010216 RAX: 000ff11004f4f8aa RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffff88807ca88000 RSI: 0000000000000077 RDI: 00000000ffffe0fe RBP: 00000000ffffe0fe R08: ffff888022a8df2b R09: 1ffff11004551be5 R10: dffffc0000000000 R11: ffffed1004551be6 R12: ffff88802a9f61a0 R13: 0000000000000077 R14: 000000000000000c R15: 007f888027a7c550 FS: 000055555fb6d500(0000) GS:ffff8881255a0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000057f000 CR3: 0000000030d9f000 CR4: 0000000000350ef0 Call Trace: squashfs_read_metadata+0x193/0x6d0 fs/squashfs/cache.c:357 squashfs_lookup+0x852/0xf20 fs/squashfs/namei.c:156 __lookup_slow+0x2b7/0x410 fs/namei.c:1916 lookup_slow+0x53/0x70 fs/namei.c:1933 walk_component fs/namei.c:2279 [inline] link_path_walk+0xd1e/0x18d0 fs/namei.c:2647 path_lookupat+0xe4/0x8c0 fs/namei.c:2803 filename_lookup+0x256/0x5d0 fs/namei.c:2833 kern_path+0x3d/0x150 fs/namei.c:3040 unix_find_bsd net/unix/af_unix.c:1215 [inline] unix_find_other+0x197/0xac0 net/unix/af_unix.c:1277 unix_dgram_connect+0x2cf/0xc20 net/unix/af_unix.c:1533 __sys_connect_file net/socket.c:2089 [inline] __sys_connect+0x312/0x450 net/socket.c:2108 __do_sys_connect net/socket.c:2114 [inline] __se_sys_connect net/socket.c:2111 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:2111 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2536d9bf79 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffb506dda8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007f2537015fa0 RCX: 00007f2536d9bf79 RDX: 000000000000006e RSI: 000020000057eff8 RDI: 0000000000000004 RBP: 00007f2536e327e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2537015fac R14: 00007f2537015fa0 R15: 00007f2537015fa0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:squashfs_copy_data+0xde/0x220 fs/squashfs/cache.c:308 Code: 74 08 4c 89 e7 e8 52 c8 91 ff 4c 63 fd 49 c1 ef 09 49 83 e7 f8 4d 03 3c 24 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 24 c8 91 ff 89 e8 25 ff 0f 00 00 4d RSP: 0018:ffffc90002ee7430 EFLAGS: 00010216 RAX: 000ff11004f4f8aa RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffff88807ca88000 RSI: 0000000000000077 RDI: 00000000ffffe0fe RBP: 00000000ffffe0fe R08: ffff888022a8df2b R09: 1ffff11004551be5 R10: dffffc0000000000 R11: ffffed1004551be6 R12: ffff88802a9f61a0 R13: 0000000000000077 R14: 000000000000000c R15: 007f888027a7c550 FS: 000055555fb6d500(0000) GS:ffff8881254a0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f413658dd30 CR3: 0000000030d9f000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 74 08 je 0xa 2: 4c 89 e7 mov %r12,%rdi 5: e8 52 c8 91 ff call 0xff91c85c a: 4c 63 fd movslq %ebp,%r15 d: 49 c1 ef 09 shr $0x9,%r15 11: 49 83 e7 f8 and $0xfffffffffffffff8,%r15 15: 4d 03 3c 24 add (%r12),%r15 19: 4c 89 f8 mov %r15,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 ff mov %r15,%rdi 33: e8 24 c8 91 ff call 0xff91c85c 38: 89 e8 mov %ebp,%eax 3a: 25 ff 0f 00 00 and $0xfff,%eax 3f: 4d rex.WRB --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup